Whole Roasted Onions Recipe (2024)

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By Courtney ODell

4.47 from 15 votes

Apr 28, 2022, Updated Mar 23, 2024

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Whole Roasted Onions Recipe – delicious buttery whole roasted onions baked to perfection – perfect as a side dish!

Whole Roasted Onions Recipe (2)

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Table of contents

  • Buttery Whole Onions
  • How To Roast Whole Onions
  • Tips and Tricks to Perfect Whole Roasted Onions
  • Recipe FAQs
  • Other Easy Side Dishes You’ll Love
  • Whole Roasted Onions Recipe
Whole Roasted Onions Recipe (3)

Buttery Whole Onions

This is the perfect gorgeous – but crazy easy – side dish for a holiday dinner or even Sunday supper – and it makes the whole house smell amazing.

These onions roast to soft, buttery perfection with just a couple herbs and spices – and are fabulous paired with pork tenderloin, steaks, turkey, chicken thighs, or any hearty main dish you love!

We hope you love this recipe as much as we do!

How To Roast Whole Onions

Roasting onions is so easy, you’re going to want to make these decadent, buttery onions for every meal!

If you can use a knife and sprinkle some herbs, you can make this side dish!

The process is relatively straightforward, following these steps:

  • Cut off the top and bottoms to onions
  • Season generously with salt and pepper
  • Top with butter and herbs
  • Bake

Tips and Tricks to Perfect Whole Roasted Onions

Baked onions are done when they are browned and very soft, which can take anywhere from 60-100 minutes.

Don’t rush your onions – make them ahead of time and reheat if you’re worried about timing for an event, as the flavor really can’t be rushed for this recipe.

Recipe FAQs

When are whole roasted onions done?

Baked onions are done when they are browned and very soft, which can take anywhere from 60-100 minutes.
Don’t rush your onions – make them ahead of time and reheat if you’re worried about timing for an event, as the flavor really can’t be rushed for this recipe.

Do you roast onion in the skin?

We roast onion in the skin for the best flavor – simply discard when serving.

Are whole roasted onions vegan?

This recipe isn’t expressly vegan, as we’re using butter.
Swap the butter for equal amounts of olive oil drizzled over the onions to make it vegan!

How long can whole roasted onions be kept?

This recipe can be stored in the refrigerator in an airtight container for up to five days.

Whole Roasted Onions Recipe (7)

Other Easy Side Dishes You’ll Love

If you’re looking for other dishes to pair alongside a pork tenderloin, London broil, turkey breast, lobster tails, or even cauliflower steaks – please check out some of our favorite side dishes below:

You can find our entire side dish recipe index here.

Whole Roasted Onions Recipe (8)

Whole Roasted Onions Recipe

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Whole Roasted Onions Recipe

Whole Roasted Onions Recipe – delicious buttery whole roasted onions baked to perfection – perfect as a side dish for pork, chicken, & steak!

Course Side dishes

Cuisine American

Keyword onions, side dish, vegetables

Prep Time 5 minutes minutes

Cook Time 1 hour hour 10 minutes minutes

Total Time 1 hour hour 15 minutes minutes

Servings 6

Calories 151kcal

Author Courtney O’Dell

Ingredients

  • 6 yellow onions
  • 6 tablespoons butter cut into 6 pats for each onion (use olive oil for vegan)
  • 1 tsp italian herb seasonings
  • 2-3 sprigs fresh rosemary or thyme
  • salt and pepper to taste

Instructions

  • Preheat oven to 350 degrees.

  • Cut the top and bottom off onion to make a flat surface, leaving peel on.

  • Place into baking dish, either lined with foil or prepped with nonstick cooking spray.

  • Sprinkle with salt, pepper, and herbs.

  • Top with a pat of butter.

  • Bake 60-90 minutes at 350 degrees, until onions are browned, very soft, and fragrant.

  • When serving, remove peel.

Nutrition

Serving: 1g | Calories: 151kcal | Carbohydrates: 11g | Protein: 2g | Fat: 12g | Saturated Fat: 7g | Polyunsaturated Fat: 4g | Cholesterol: 31mg | Sodium: 144mg | Fiber: 2g | Sugar: 5g

Categorized as:
gluten free, One Pot, Recipes, Side Dishes, Vegetables

About Courtney

Courtney loves to share great wine, good food, and loves to explore far flung places- all while masting an everyday elegant and easy style at lifestyle blog Sweet C’s Designs. Sweet C's devoted to finding the best food and drinks you'll want to make or find, around the world!

Read More About Me

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Whole Roasted Onions Recipe (2024)

FAQs

What kind of onion is best for roasting? ›

We recommend using yellow or red, because they hold up well during the roast. How do you cut an onion for roasting? We trim and peel the onions, and cut them into wedges for this preparation.

Are roasted onions good for you? ›

Onions offer many benefits for your health, including reducing risk for cancer and heart disease. They also have fiber which can help with digestion. This is a great way to use any extra onions you may have.

What is the best onion to eat whole? ›

While their color is similar to the yellow onion, white onions have a thinner, more-papery skin. They are also known for their consistently milder flavor, making them a better choice for serving raw.

Which onion has the most flavor when cooked? ›

White onions are probably the strongest-tasting onion on this list. They're typically used in Asian and Mexican dishes, as well as potato and macaroni salads. You can also sauté them, making them ideal for French onion soup or any other food in which you want to add sweet or sour flavor.

How to roast onion without oil? ›

Add a little water to the pan — start with 3 Tbsp (as original recipe is written). Add sliced onions and stir. Then cover. Cook for a total of 30-40 minutes, opening the lid and stirring every 5 minutes.

Which organ benefits most from eating onions? ›

The antioxidants and anti-inflammatory properties onions contain make consuming onions great for your heart health. Not only that, but they are also highly nutritious and delicious! Read on to discover these ten health benefits of onions and how they can make a delicious difference in any meal.

Why don't I eat onions at night? ›

Onions. Eating onions before going to bed can cause acid reflux. The gas created as onions move through your system can place pressure inside of your stomach and force acid into your esophagus. This effect is seen with both grilled and raw onions and is especially likely to occur when you are in a prone position.

How many whole onions can you eat a day? ›

It is recommended to eat 100 grams of onions every day. Onions are rich in nutrients. They not only contain protein, crude fiber, folic acid, various vitamins, calcium, selenium, potassium, phosphorus and other minerals, but also contain two special substances: quercetin and prostaglandin A.

What oil to use to cook onions? ›

You can use either oil or butter to caramelize onions — but ideally, you use a combination of both! I like to use olive oil, and this cooking fat tolerates heat particularly well. Meanwhile, butter adds a distinctly rich flavor to the caramelized onions.

What temperature do you caramelize onions in the oven? ›

Bake 375 degrees F for about 45-50 minutes.

Do you cook onions covered or uncovered? ›

The first phase of the process is softening the onions so that they collapse into a tender mass while releasing a good deal of their liquid. If you cover the pan, you'll trap steam, which will speed up their softening, heat them more quickly, and help release their liquid more quickly.

What are the best onions for cooking meat? ›

Yellow onions are the most popular cooking onions because they add excellent flavor to most stews, soups, and meat dishes. In fact, typically when a cooked recipe calls for onion, yellow onion is a safe way to go. Yellow onions have a yellow-brown papery skin on the outside and a white flesh.

Which onions are better for caramelizing? ›

You can caramelize any kind of onion, but yellow or Spanish onions tend to offer the most balanced-sweet-savory flavor profile and are the most versatile for different dishes. Sweet onions, such as Vidalia or Walla Walla work too, but keep in mind that their flavor will become even sweeter once caramelized.

Which onion is better in chili? ›

Sweet onions are known for their natural sweetness, making them a fantastic choice for adding a sweet flavor to chili without the need for extra sugar. Sweet onions are great for caramelizing due to their higher sugar content.

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